Single-Family and Two-Family Development

Drainage Design Requirements

Applicability:

Individual single-family and two-family development and redevelopment that do not disturb more than twenty thousand (20,000) square feet of land area, including cumulative disturbance as of the adoption of the Land Use Management Ordinance on January 27, 2003, provided they are not part of a larger common plan of development.

Performance Standard:

Runoff shall be discharged in a non-erosive and diffuse manner using techniques approved by the Town Manager. Discharge system/techniques shall be in accordance with the standards established in the Town’s Design Manual.

Design Guidelines:

  • Consider the site conditions when planning the project
  • Minimize the impervious area footprint
  • Minimize the amount of land disturbance
  • Maintain natural drainage patterns as much as possible
  • All runoff must be discharged in a non-erosive and diffuse manner
  • No drainage outlets are permitted in setbacks or riparian buffers
  • Energy dissipators are required at all outlets

Drainage Plan Requirements:

  • Topography (2-foot contours)
  • Existing drainage conditions with flow direction arrows
  • Proposed grading and drainage patterns with flow direction arrows
  • Floodplain, RCD, and Jordan Riparian Buffer boundaries delineated and clearly labeled (note ephemeral streams on site)
  • Existing and proposed roof drain locations
  • Outlet dissipator dimensions and details
  • Drainage conveyance system (piping and swales)
  • Permanent stabilization and planting plans and specifications
  • Drainage easements, if offsite runoff is conveyed through the project site

Standard Details:
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